watchdog timer device for restarting crashing esp32

[joshua-8]

Doug Wilkinson suggested that we think of a way to automatically reset the esp32 if it locks up.

ESP32s seem to have some internal watchdog timer features-look into enabling that

A second microcontroller could reset the esp32 if the esp32 stops telling the microcontroller that it is functioning. The second microcontroller could be a much simpler device, or maybe a second esp32 that could actually communicate with us or even take over.